/**
 * Licensed to Jasig under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Jasig licenses this file to you under the Apache License,
 * Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a
 * copy of the License at:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.jasig.cas.client.authentication;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

public final class DefaultGatewayResolverImpl implements GatewayResolver {
	
    public static final String CONST_CAS_GATEWAY = "_const_cas_gateway_";

	public boolean hasGatewayedAlready(final HttpServletRequest request,
			final String serviceUrl) {
		final HttpSession session = request.getSession(false);
		
		if (session == null) {
			return false;
		}
		
		final boolean result = session.getAttribute(CONST_CAS_GATEWAY) != null;
		session.removeAttribute(CONST_CAS_GATEWAY);
		return result;
	}

	public String storeGatewayInformation(final HttpServletRequest request,
			final String serviceUrl) {
		request.getSession(true).setAttribute(CONST_CAS_GATEWAY, "yes");
		return serviceUrl;
	}
}
